<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="all" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <PersonList
          v-for="(item, index) in goodList"
          :key="index"
          :obj="item"
          v-model="item.num"
          @change="item.checked = !item.checked"
          :index="index"
          @del="del($event)"
        ></PersonList>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:{{ sumTotal }}</td>
          <td colspan="5"></td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import PersonList from "./components/PersonList.vue";
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  components: {
    PersonList,
  },
  computed: {
    all: {
      get() {
        return this.goodList.every((item) => item.checked === true);
      },
      set(value) {
        this.goodList = this.goodList.map((item) => {
          item.checked = value;
          return item;
        });
      },
    },
    sumTotal: {
      get() {
        return this.goodList.reduce(
          (sum, item) => (sum += item.price * item.num),
          0
        );
      },
    },
  },
  methods: {
    del(index) {
      this.goodList.splice(index, 1);
    },
  },
};
</script>

<style>
table {
  text-align: center;
}
</style>
